NERVOUS SYSTEM 



TABLE i9— Continued 



89 



layer the diameters of both the cells and nuclei undergo a sub- 

 stantial decrease from 30 days to the end of the record. Thus 

 rapid growth of these cells in both layers is completed shortly 

 before or shortly after weaning time. The decrease in the 

 diameter of the pyramidal cells after the cessation of rapid 

 growth is a phenomenon which has been observed in other 

 cases. 



In the present instance however the values have been reduced 

 to those for the fresh cells and this makes it probable that in 

 all these instances we are dealing with a real reduction of the 



